Why is my ESPA Multipool Plus pump not running and leaking at the motor/pump coupling while it is powered?

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If your ESPA Multipool Plus pump is not running and leaking at the coupling between the motor and the pump despite being powered, this generally indicates a mechanical problem with the sealing or a blockage of the shaft. This combined symptom (no rotation + leak at the coupling) suggests that the pump shaft is blocked and the sealing gasket is damaged.

Main causes: The first cause is that the pump shaft may be blocked by debris, an internal obstruction, or wear of the internal components. When the shaft is blocked, it cannot turn despite the motor being powered, which causes a buildup of pressure and leaks at the sealing gasket of the coupling (located between the motor and the pump body). The second possible cause is wear or rupture of the mechanical sealing gasket itself, which is a critical component of your Multipool Plus as it must seal the interface between the shaft and the pump body. In case of dry running or after a long period of non-use, this gasket can be damaged quickly.

Diagnosing the problem: Before any intervention, cut the power supply to the pump. First, visually check that the coupling and the gaskets around the shaft do not have visible cracks or deformations. Try to manually turn the shaft by grasping it directly (after ensuring it is dry and the power is off): if the shaft does not turn at all, it is blocked. Also check that the suction hose is not obstructed and that the pump body does not contain debris that could have blocked the turbine.

Recommended actions: If the shaft is completely blocked or if the leak is significant, the pump requires disassembly and revision by an authorized ESPA technical service. The worn mechanical sealing gasket must be replaced, and if the coupling is damaged, it must also be changed. Do not attempt to force the shaft to turn, as this could further damage the coupling. Also check that the pump has not run dry before this malfunction, as this is the main cause of accelerated wear of the sealing gasket according to the Multipool Plus manual.

Prevention for the future: Ensure that the suction hose is always submerged in water and that the pump is filled with water before each startup. Seal all connections and gaskets perfectly to prevent air from entering. Drain the pump if it is not used for a long period, as stagnant water can corrode internal components and degrade the sealing gasket.

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